function validateTwoFields(form) {
    var bValid = true;
    var focusField = null;
    var i = 0;
    var fields = new Array();
    oTwoFields = new twofields();
    for (x in oTwoFields) {
        var field = form[oTwoFields[x][0]];
        var secondField = form[oTwoFields[x][2]("secondProperty")];

        if (field.type == 'text' ||
            field.type == 'textarea' ||
            field.type == 'select-one' ||
            field.type == 'radio' ||
            field.type == 'password') {

            var value;
            var secondValue;
            // get field's value
            if (field.type == "select-one") {
                var si = field.selectedIndex;
                value = field.options[si].value;
                secondValue = secondField.options[si].value;
            } else {
                value = field.value;
                secondValue = secondField.value;
            }

            if (value != secondValue) {

                if (i == 0) {
                    focusField = field;
                }
                fields[i++] = oTwoFields[x][1];
                bValid = false;
            }
        }
    }

    if (fields.length > 0) {
        focusField.focus();
        alert(fields.join('\n'));
    }

    return bValid;
}
function validateMinLength(form) {
    var isValid = true;
    var focusField = null;
    var i = 0;
    var fields = new Array();
    oMinLength = new minlength();
    for (x in oMinLength) {
        var field = form[oMinLength[x][0]];

        if ((field.type == 'hidden' ||
             field.type == 'text' ||
             field.type == 'password' ||
             field.type == 'textarea') &&
            field.disabled == false) {
            var iMin = parseInt(oMinLength[x][2]("minlength"));
            if ((trim(field.value).length > 0) && (field.value.length < iMin)) {
                if (i == 0) {
                    focusField = field;
                }
                fields[i++] = oMinLength[x][1];
                isValid = false;
            }
        }
    }
    if (fields.length > 0) {
        focusField.focus();
        alert(fields.join('\n'));
    }
    return isValid;
}
function validateFloatRange(form) {
    var isValid = true;
    var focusField = null;
    var i = 0;
    var fields = new Array();
    oRange = new floatRange();
    for (x in oRange) {
        var field = form[oRange[x][0]];

        if ((field.type == 'text' ||
             field.type == 'textarea') &&
            (field.value.length > 0)) {

            var fMin = parseFloat(oRange[x][2]("min"));
            var fMax = parseFloat(oRange[x][2]("max"));
            var fValue = parseFloat(field.value);
            if (!(fValue >= fMin && fValue <= fMax)) {
                if (i == 0) {
                    focusField = field;
                }
                fields[i++] = oRange[x][1];
                isValid = false;
            }
        }
    }
    if (fields.length > 0) {
        focusField.focus();
        alert(fields.join('\n'));
    }
    return isValid;
}
function validateIntRange(form) {
    var isValid = true;
    var focusField = null;
    var i = 0;
    var fields = new Array();
    oRange = new intRange();
    for (x in oRange) {
        var field = form[oRange[x][0]];

        if ((field.type == 'text' ||
             field.type == 'textarea') &&
            (field.value.length > 0)) {

            var iMin = parseInt(oRange[x][2]("min"));
            var iMax = parseInt(oRange[x][2]("max"));
            var iValue = parseInt(field.value);
            if (!(iValue >= iMin && iValue <= iMax)) {
                if (i == 0) {
                    focusField = field;
                }
                fields[i++] = oRange[x][1];
                isValid = false;
            }
        }
    }
    if (fields.length > 0) {
        focusField.focus();
        alert(fields.join('\n'));
    }
    return isValid;
}
function validateRange(form) {
    return validateIntRange(form);
}
function validateInteger(form) {
    var bValid = true;
    var focusField = null;
    var i = 0;
    var fields = new Array();
    oInteger = new IntegerValidations();
    for (x in oInteger) {
        var field = form[oInteger[x][0]];

        if (field.type == 'text' ||
            field.type == 'textarea' ||
            field.type == 'select-one' ||
            field.type == 'radio') {

            var value = '';
            // get field's value
            if (field.type == "select-one") {
                var si = field.selectedIndex;
                if (si >= 0) {
                    value = field.options[si].value;
                }
            } else {
                value = field.value;
            }

            if (value.length > 0) {

                if (!isAllDigits(value)) {
                    bValid = false;
                    if (i == 0) {
                        focusField = field;
                    }
                    fields[i++] = oInteger[x][1];

                } else {
                    var iValue = parseInt(value);
                    if (isNaN(iValue) || !(iValue >= -2147483648 && iValue <= 2147483647)) {
                        if (i == 0) {
                            focusField = field;
                        }
                        fields[i++] = oInteger[x][1];
                        bValid = false;
                    }
                }
            }
        }
    }
    if (fields.length > 0) {
        focusField.focus();
        alert(fields.join('\n'));
    }
    return bValid;
}

function isAllDigits(argvalue) {
    argvalue = argvalue.toString();
    var validChars = "0123456789";
    var startFrom = 0;
    if (argvalue.substring(0, 2) == "0x") {
        validChars = "0123456789abcdefABCDEF";
        startFrom = 2;
    } else if (argvalue.charAt(0) == "0") {
        validChars = "01234567";
        startFrom = 1;
    } else if (argvalue.charAt(0) == "-") {
        startFrom = 1;
    }

    for (var n = startFrom; n < argvalue.length; n++) {
        if (validChars.indexOf(argvalue.substring(n, n + 1)) == -1) return false;
    }
    return true;
}
function validateMask(form) {
    var isValid = true;
    var focusField = null;
    var i = 0;
    var fields = new Array();
    oMasked = new mask();
    for (x in oMasked) {
        var field = form[oMasked[x][0]];

        if ((field.type == 'text' ||
             field.type == 'textarea') &&
            (field.value.length > 0)) {

            if (!matchPattern(field.value, oMasked[x][2]("mask"))) {
                if (i == 0) {
                    focusField = field;
                }
                fields[i++] = oMasked[x][1];
                isValid = false;
            }
        }
    }

    if (fields.length > 0) {
        focusField.focus();
        alert(fields.join('\n'));
    }
    return isValid;
}

function matchPattern(value, mask) {
    return mask.exec(value);
}
function validateDate(form) {
    var bValid = true;
    var focusField = null;
    var i = 0;
    var fields = new Array();
    oDate = new DateValidations();
    for (x in oDate) {
        var value = form[oDate[x][0]].value;
        var datePattern = oDate[x][2]("datePatternStrict");
        if ((form[oDate[x][0]].type == 'text' ||
             form[oDate[x][0]].type == 'textarea') &&
            (value.length > 0) &&
            (datePattern.length > 0)) {
            var MONTH = "MM";
            var DAY = "dd";
            var YEAR = "yyyy";
            var orderMonth = datePattern.indexOf(MONTH);
            var orderDay = datePattern.indexOf(DAY);
            var orderYear = datePattern.indexOf(YEAR);
            if ((orderDay < orderYear && orderDay > orderMonth)) {
                var iDelim1 = orderMonth + MONTH.length;
                var iDelim2 = orderDay + DAY.length;
                var delim1 = datePattern.substring(iDelim1, iDelim1 + 1);
                var delim2 = datePattern.substring(iDelim2, iDelim2 + 1);
                if (iDelim1 == orderDay && iDelim2 == orderYear) {
                    dateRegexp = new RegExp("^(\\d{2})(\\d{2})(\\d{4})$");
                } else if (iDelim1 == orderDay) {
                    dateRegexp = new RegExp("^(\\d{2})(\\d{2})[" + delim2 + "](\\d{4})$");
                } else if (iDelim2 == orderYear) {
                    dateRegexp = new RegExp("^(\\d{2})[" + delim1 + "](\\d{2})(\\d{4})$");
                } else {
                    dateRegexp = new RegExp("^(\\d{2})[" + delim1 + "](\\d{2})[" + delim2 + "](\\d{4})$");
                }
                var matched = dateRegexp.exec(value);
                if (matched != null) {
                    if (!isValidDate(matched[2], matched[1], matched[3])) {
                        if (i == 0) {
                            focusField = form[oDate[x][0]];
                        }
                        fields[i++] = oDate[x][1];
                        bValid = false;
                    }
                } else {
                    if (i == 0) {
                        focusField = form[oDate[x][0]];
                    }
                    fields[i++] = oDate[x][1];
                    bValid = false;
                }
            } else if ((orderMonth < orderYear && orderMonth > orderDay)) {
                var iDelim1 = orderDay + DAY.length;
                var iDelim2 = orderMonth + MONTH.length;
                var delim1 = datePattern.substring(iDelim1, iDelim1 + 1);
                var delim2 = datePattern.substring(iDelim2, iDelim2 + 1);
                if (iDelim1 == orderMonth && iDelim2 == orderYear) {
                    dateRegexp = new RegExp("^(\\d{2})(\\d{2})(\\d{4})$");
                } else if (iDelim1 == orderMonth) {
                    dateRegexp = new RegExp("^(\\d{2})(\\d{2})[" + delim2 + "](\\d{4})$");
                } else if (iDelim2 == orderYear) {
                    dateRegexp = new RegExp("^(\\d{2})[" + delim1 + "](\\d{2})(\\d{4})$");
                } else {
                    dateRegexp = new RegExp("^(\\d{2})[" + delim1 + "](\\d{2})[" + delim2 + "](\\d{4})$");
                }
                var matched = dateRegexp.exec(value);
                if (matched != null) {
                    if (!isValidDate(matched[1], matched[2], matched[3])) {
                        if (i == 0) {
                            focusField = form[oDate[x][0]];
                        }
                        fields[i++] = oDate[x][1];
                        bValid = false;
                    }
                } else {
                    if (i == 0) {
                        focusField = form[oDate[x][0]];
                    }
                    fields[i++] = oDate[x][1];
                    bValid = false;
                }
            } else if ((orderMonth > orderYear && orderMonth < orderDay)) {
                var iDelim1 = orderYear + YEAR.length;
                var iDelim2 = orderMonth + MONTH.length;
                var delim1 = datePattern.substring(iDelim1, iDelim1 + 1);
                var delim2 = datePattern.substring(iDelim2, iDelim2 + 1);
                if (iDelim1 == orderMonth && iDelim2 == orderDay) {
                    dateRegexp = new RegExp("^(\\d{4})(\\d{2})(\\d{2})$");
                } else if (iDelim1 == orderMonth) {
                    dateRegexp = new RegExp("^(\\d{4})(\\d{2})[" + delim2 + "](\\d{2})$");
                } else if (iDelim2 == orderDay) {
                    dateRegexp = new RegExp("^(\\d{4})[" + delim1 + "](\\d{2})(\\d{2})$");
                } else {
                    dateRegexp = new RegExp("^(\\d{4})[" + delim1 + "](\\d{2})[" + delim2 + "](\\d{2})$");
                }
                var matched = dateRegexp.exec(value);
                if (matched != null) {
                    if (!isValidDate(matched[3], matched[2], matched[1])) {
                        if (i == 0) {
                            focusField = form[oDate[x][0]];
                        }
                        fields[i++] = oDate[x][1];
                        bValid = false;
                    }
                } else {
                    if (i == 0) {
                        focusField = form[oDate[x][0]];
                    }
                    fields[i++] = oDate[x][1];
                    bValid = false;
                }
            } else {
                if (i == 0) {
                    focusField = form[oDate[x][0]];
                }
                fields[i++] = oDate[x][1];
                bValid = false;
            }
        }
    }
    if (fields.length > 0) {
        focusField.focus();
        alert(fields.join('\n'));
    }
    return bValid;
}

function isValidDate(day, month, year) {
    if (month < 1 || month > 12) {
        return false;
    }
    if (day < 1 || day > 31) {
        return false;
    }
    if ((month == 4 || month == 6 || month == 9 || month == 11) &&
        (day == 31)) {
        return false;
    }
    if (month == 2) {
        var leap = (year % 4 == 0 &&
                    (year % 100 != 0 || year % 400 == 0));
        if (day > 29 || (day == 29 && !leap)) {
            return false;
        }
    }
    return true;
}
function validateFloat(form) {
    var bValid = true;
    var focusField = null;
    var i = 0;
    var fields = new Array();
    oFloat = new FloatValidations();
    for (x in oFloat) {
        var field = form[oFloat[x][0]];

        if (field.type == 'text' ||
            field.type == 'textarea' ||
            field.type == 'select-one' ||
            field.type == 'radio') {

            var value = '';
            // get field's value
            if (field.type == "select-one") {
                var si = field.selectedIndex;
                if (si >= 0) {
                    value = field.options[si].value;
                }
            } else {
                value = field.value;
            }

            if (value.length > 0) {
                // remove '.' before checking digits
                var tempArray = value.split('.');
                var joinedString = tempArray.join('');

                if (!isAllDigits(joinedString)) {
                    bValid = false;
                    if (i == 0) {
                        focusField = field;
                    }
                    fields[i++] = oFloat[x][1];

                } else {
                    var iValue = parseFloat(value);
                    if (isNaN(iValue)) {
                        if (i == 0) {
                            focusField = field;
                        }
                        fields[i++] = oFloat[x][1];
                        bValid = false;
                    }
                }
            }
        }
    }
    if (fields.length > 0) {
        focusField.focus();
        alert(fields.join('\n'));
    }
    return bValid;
}
function validateCreditCard(form) {
    var bValid = true;
    var focusField = null;
    var i = 0;
    var fields = new Array();
    oCreditCard = new creditCard();
    for (x in oCreditCard) {
        if ((form[oCreditCard[x][0]].type == 'text' ||
             form[oCreditCard[x][0]].type == 'textarea') &&
            (form[oCreditCard[x][0]].value.length > 0)) {
            if (!luhnCheck(form[oCreditCard[x][0]].value)) {
                if (i == 0) {
                    focusField = form[oCreditCard[x][0]];
                }
                fields[i++] = oCreditCard[x][1];
                bValid = false;
            }
        }
    }
    if (fields.length > 0) {
        focusField.focus();
        alert(fields.join('\n'));
    }
    return bValid;
}

/**
 * Reference: http://www.ling.nwu.edu/~sburke/pub/luhn_lib.pl
 */
function luhnCheck(cardNumber) {
    if (isLuhnNum(cardNumber)) {
        var no_digit = cardNumber.length;
        var oddoeven = no_digit & 1;
        var sum = 0;
        for (var count = 0; count < no_digit; count++) {
            var digit = parseInt(cardNumber.charAt(count));
            if (!((count & 1) ^ oddoeven)) {
                digit *= 2;
                if (digit > 9) digit -= 9;
            }
            ;
            sum += digit;
        }
        ;
        if (sum == 0) return false;
        if (sum % 10 == 0) return true;
    }
    ;
    return false;
}

function isLuhnNum(argvalue) {
    argvalue = argvalue.toString();
    if (argvalue.length == 0) {
        return false;
    }
    for (var n = 0; n < argvalue.length; n++) {
        if ((argvalue.substring(n, n + 1) < "0") ||
            (argvalue.substring(n, n + 1) > "9")) {
            return false;
        }
    }
    return true;
}
function validateShort(form) {
    var bValid = true;
    var focusField = null;
    var i = 0;
    var fields = new Array();
    oShort = new ShortValidations();
    for (x in oShort) {
        var field = form[oShort[x][0]];

        if (field.type == 'text' ||
            field.type == 'textarea' ||
            field.type == 'select-one' ||
            field.type == 'radio') {

            var value = '';
            // get field's value
            if (field.type == "select-one") {
                var si = field.selectedIndex;
                if (si >= 0) {
                    value = field.options[si].value;
                }
            } else {
                value = field.value;
            }

            if (value.length > 0) {
                if (!isAllDigits(value)) {
                    bValid = false;
                    if (i == 0) {
                        focusField = field;
                    }
                    fields[i++] = oShort[x][1];

                } else {

                    var iValue = parseInt(value);
                    if (isNaN(iValue) || !(iValue >= -32768 && iValue <= 32767)) {
                        if (i == 0) {
                            focusField = field;
                        }
                        fields[i++] = oShort[x][1];
                        bValid = false;
                    }
                }
            }
        }
    }
    if (fields.length > 0) {
        focusField.focus();
        alert(fields.join('\n'));
    }
    return bValid;
}
function validateMaxLength(form) {
    var isValid = true;
    var focusField = null;
    var i = 0;
    var fields = new Array();

    oMaxLength = new maxlength();
    for (x in oMaxLength) {
        var field = form[oMaxLength[x][0]];

        if ((field.type == 'hidden' ||
             field.type == 'text' ||
             field.type == 'password' ||
             field.type == 'textarea') &&
            field.disabled == false) {

            var iMax = parseInt(oMaxLength[x][2]("maxlength"));
            if (field.value.length > iMax) {
                if (i == 0) {
                    focusField = field;
                }
                fields[i++] = oMaxLength[x][1];
                isValid = false;
            }
        }
    }
    if (fields.length > 0) {
        focusField.focus();
        alert(fields.join('\n'));
    }
    return isValid;
}
function validateEmail(form) {
    var bValid = true;
    var focusField = null;
    var i = 0;
    var fields = new Array();
    oEmail = new email();
    for (x in oEmail) {
        if ((form[oEmail[x][0]].type == 'text' ||
             form[oEmail[x][0]].type == 'textarea') &&
            (form[oEmail[x][0]].value.length > 0)) {
            if (!checkEmail(form[oEmail[x][0]].value)) {
                if (i == 0) {
                    focusField = form[oEmail[x][0]];
                }
                fields[i++] = oEmail[x][1];
                bValid = false;
            }
        }
    }
    if (fields.length > 0) {
        focusField.focus();
        alert(fields.join('\n'));
    }
    return bValid;
}

/**
 * Reference: Sandeep V. Tamhankar (stamhankar@hotmail.com),
 * http://javascript.internet.com
 */
function checkEmail(emailStr) {
    if (emailStr.length == 0) {
        return true;
    }
    var emailPat = /^(.+)@(.+)$/;
    var specialChars = "\\(\\)<>@,;:\\\\\\\"\\.\\[\\]";
    var validChars = "\[^\\s" + specialChars + "\]";
    var quotedUser = "(\"[^\"]*\")";
    var ipDomainPat = /^(\d{1,3})[.](\d{1,3})[.](\d{1,3})[.](\d{1,3})$/;
    var atom = validChars + '+';
    var word = "(" + atom + "|" + quotedUser + ")";
    var userPat = new RegExp("^" + word + "(\\." + word + ")*$");
    var domainPat = new RegExp("^" + atom + "(\\." + atom + ")*$");
    var matchArray = emailStr.match(emailPat);
    if (matchArray == null) {
        return false;
    }
    var user = matchArray[1];
    var domain = matchArray[2];
    if (user.match(userPat) == null) {
        return false;
    }
    var IPArray = domain.match(ipDomainPat);
    if (IPArray != null) {
        for (var i = 1; i <= 4; i++) {
            if (IPArray[i] > 255) {
                return false;
            }
        }
        return true;
    }
    var domainArray = domain.match(domainPat);
    if (domainArray == null) {
        return false;
    }
    var atomPat = new RegExp(atom, "g");
    var domArr = domain.match(atomPat);
    var len = domArr.length;
    if ((domArr[domArr.length - 1].length < 2) ||
        (domArr[domArr.length - 1].length > 3)) {
        return false;
    }
    if (len < 2) {
        return false;
    }
    return true;
}
function validateByte(form) {
    var bValid = true;
    var focusField = null;
    var i = 0;
    var fields = new Array();
    oByte = new ByteValidations();
    for (x in oByte) {
        var field = form[oByte[x][0]];

        if (field.type == 'text' ||
            field.type == 'textarea' ||
            field.type == 'select-one' ||
            field.type == 'radio') {

            var value = '';
            // get field's value
            if (field.type == "select-one") {
                var si = field.selectedIndex;
                if (si >= 0) {
                    value = field.options[si].value;
                }
            } else {
                value = field.value;
            }

            if (value.length > 0) {
                if (!isAllDigits(value)) {
                    bValid = false;
                    if (i == 0) {
                        focusField = field;
                    }
                    fields[i++] = oByte[x][1];

                } else {

                    var iValue = parseInt(value);
                    if (isNaN(iValue) || !(iValue >= -128 && iValue <= 127)) {
                        if (i == 0) {
                            focusField = field;
                        }
                        fields[i++] = oByte[x][1];
                        bValid = false;
                    }
                }
            }

        }
    }
    if (fields.length > 0) {
        focusField.focus();
        alert(fields.join('\n'));
    }
    return bValid;
}
function validateRequired(form) {
    var isValid = true;
    var focusField = null;
    var i = 0;
    var fields = new Array();
    oRequired = new required();
    for (x in oRequired) {
        var field = form[oRequired[x][0]];

        if (field.type == 'text' ||
            field.type == 'textarea' ||
            field.type == 'file' ||
            field.type == 'select-one' ||
            field.type == 'radio' ||
            field.type == 'password') {

            var value = '';
            // get field's value
            if (field.type == "select-one") {
                var si = field.selectedIndex;
                if (si >= 0) {
                    value = field.options[si].value;
                }
            } else {
                value = field.value;
            }

            if (trim(value).length == 0) {

                if (i == 0) {
                    focusField = field;
                }
                fields[i++] = oRequired[x][1];
                isValid = false;
            }
        }
    }
    if (fields.length > 0) {
        focusField.focus();
        alert(fields.join('\n'));
    }
    return isValid;
}

// Trim whitespace from left and right sides of s.
function trim(s) {
    return s.replace(/^\s*/, "").replace(/\s*$/, "");
}

